[Varda]

There's a cave in Britain containing hundreds of dead (many babies). It's believed they were thrown in the pit as a sacrifice over a period of years in the Bronze age. Some of the bones show signs of cannibalism. I believe the excavations were abandoned because the site was dangerous.

[epluribus_2]

Could be a plague where ignorant savages decided that evil corpses had spirits in their heads, and took public safety steps to protect the tribe.